Depolarization of a Cardiac Muscle Cell Occurs as the Result

Multiple Choice

Depolarization of a cardiac muscle cell occurs as the result of a:

A) decrease in the permeability of the cell membrane to potassium.
B) rapid movement of sodium into the cell.
C) rapid movement of calcium into the cell.
D) slow movement of sodium out of the cell.
E) slow movement of calcium out of the cell.